* {
    margin: 0;
    padding: 0;
}

.bg video {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

em {
    font-style: normal;
}

li {
    list-style: none;
}

.wh h3 {
    /* 只能在定位上生效 */
    position: absolute;
    font-family: '华文彩云';
    font-size: 50px;
    color: rgba(0, 0, 0, 0.5);
    z-index: 99;
}

.wh .search {
    width: 350px;
    position: absolute;
    top: 50px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99;
    border-radius: 5px;
    overflow: hidden;
}

.wh .search input {
    float: left;
    width: 280px;
    height: 50px;
    outline: none;
    border: none;
    padding-left: 10px;
    color: white;
    font-size: 20px;
    background-color: rgba(82, 158, 152, 0.5);
}

.wh .search button {
    float: left;
    width: 60px;
    height: 50px;
    border: none;
    color: white;
    background-color: rgba(63, 63, 63, 0.5);
}

.wh .search ul li {
    font-size: 12px;
    list-style: none;
    float: left;
    margin-left: 5px;
}

.wh .search ul li:hover {
    color: red;
}

.wh .tab {
    width: 800px;
    position: absolute;
    top: 150px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 99;
    background-color: rgba(233, 255, 241, 0.3);
}

.wh .tab li {
    margin: 2px;
    border-bottom: 1px solid rgba(0, 0, 0, 0.3);
}

.wh .tab li span {
    margin-left: 5px;
}